use android device as webcam

# install scrcpy & v4l kernel module & utils
sudo zypper in -y v4l2loopback-kmp-default v4l-utils scrcpy
sudo scrcpy-update-server

# start v2l kernel module
sudo modprobe v4l2loopback

# get video device list
v4l2-ctl --list-devices

# run stream
scrcpy --video-source=camera --v4l2-sink=/dev/video<n> --no-video-playback --no-window

# check stream by vlc
vlc v4l2:///dev/video<n>